the Department of the Navy has adopted a new policy which requires that open source software must be considered in every software acquisition the Navy makes.
Department of the Navy CIO Robert J. Carey signed a memorandum (pdf download) today entitled "DEPARTMENT OF THE NAVY OPEN SOURCE SOFTWARE GUIDANCE" which first notes that misconceptions about whether or not open source software qualifies as COTS (commercial off-the-shelf) or GOTS (government off-the-shelf) software has hindered the Navy's ability to fully utilize open source software.
http://www.linux.com/article.pl?sid=07/06/06/0135204